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Reports <b>abstract</b> classes which can be converted to interfaces.
A class may be converted to an interface if it has no superclass (other
than Object), has no fields declared that are not <b>static</b>, <b>final</b>, and <b>public</b>, and has no
methods declared that are not <b>public</b> and <b>abstract</b> and no inner classes that are not <b>public</b>.
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Use the checkbox below to report classes containing <b>static</b> methods and non-abstract methods which can be converted to <b>default</b>
  methods, when using a language level of 8 or higher .
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